https:$//$www$.$chegg.com$/$chat$?$search$=\%3$Cdiv$\%3$E$\%3$Cp$\%3$EIn$+$a$+$text$+$messaging$+$system$\%2$C$+$data$+$is$+$sent$+$from$+$one$+$device$+$to$+$another.$+$Devices$+$are$+$recognized$+$by$+$a$+$unique$+$device$+$ID$.+$The$+$format$+$of$+$the$+$message$+$is$+$sent$+$as$+$a$+$string$+$with$+$information$+$about$+$the$+$number$+$of$+$characters$+$in$+$the$+$device$+$ID$\%2$C$+$the$+$device$+$ID$+$itself$\%2$C$+$the$+$number$+$of$+$characters$+$in$+$the$+$text$+$message$+$and$+$the$+$text$+$message$+$that$+$is$+$being$+$sent$+$with$+$each$+$part$+$being$+$separated$+$by$+$a$+$space.$+$The$+$system$+$uses$+$this$+$information$+$to$+$send$+$the$+$message$+$to$+$the$+$correct$+$device$+$and$+$the$+$receiving$+$device$+$displays$+$only$+$the$+$text$+$message.$+$The$+$number$+$of$+$words$+$in$+$the$+$text$+$message$+$is$+$also$+$useful.$+$A$+$word$+$is$+$defined$+$by$+$strings$+$separated$+$by$+$spaces.$\%0$A$\%0$AHere$+$is$+$a$+$sample$+$VALID$+$message$\%3$A$\%0$A$04+1234+05+$hello$\%0$A$\%0$AThe$+$first$+$two$+$digits$+$in$+$the$+$string$+$represent$+$the$+$length$+$of$+$the$+$device$+$ID$+$to$+$follow.$\%0$A$\%0$AThe$+$device$+$ID$+$is$+$the$+$number$+$of$+$characters$+$following$+$the$+$length.$+$Note$+$that$+$the$+$device$+$ID$+$may$+$not$+$be$+$limited$+$to$+$number$+$values.$\%0$A$\%0$AFollowing$+$the$+$device$+$ID$+$is$+$the$+$length$+$of$+$the$+$text$+$message$+$and$+$then$+$the$+$text$+$message$+$itself.$+$The$+$text$+$message$+$may$+$be$+$any$+$combination$+$of$+$characters$+\%28$such$+$as$+$letters$\%2$C$+$numbers$+$or$+$symbols$\%29+$and$+$may$+$include$+$spaces.$\%0$A$\%0$AThis$+$message$+$contains$+$one$+$word.$\%0$A$\%0$AHere$+$is$+$a$+$sample$+$INVALID$+$message$\%3$A$\%0$A$06+$a$2$b$10+09+$I$\%$E$2\%80\%99$m$+$ready$\%0$A$\%0$AThe$+$first$+$two$+$values$+06+$indicate$+$the$+$device$+$ID$+$length.$+$The$+$device$+$ID$+$is$+$a$2$b$10+$which$+$has$+$a$+$length$+$of$+5.+$This$+$does$+$not$+$match$+$the$+$specified$+$length$+06.+$Thus$\%2$C$+$this$+$is$+$NOT$+$a$+$valid$+$message.$\%0$A$\%0$AThis$+$message$+$contains$+$two$+$words.$\%0$A$\%0$AThe$+$Message$+$class$+$represents$+$messages$+$in$+$this$+$system.$+$A$+$Message$+$must$+$have$+$a$+$device$+$ID$\%2$C$+$the$+$length$+$of$+$the$+$ID$\%2$C$+$the$+$length$+$of$+$the$+$message$+$and$+$the$+$text$+$message$+$being$+$sent$+$in$+$order$+$to$+$be$+$a$+$valid$+$message$+$sent$+$through$+$the$+$system.$+$The$+$Message$+$class$+$must$+$determine$+$if$+$a$+$message$+$is$+$valid$+$in$+$order$+$to$+$send$+$a$+$message.$+$A$+$valid$+$message$+$is$+$one$+$where$+$the$+$device$+$ID$+$length$+$matches$+$the$+$given$+$length$+$in$+$the$+$message$+$string$+$and$+$the$+$text$+$message$+$length$+$matches$+$the$+$length$+$of$+$the$+$supplied$+$text$+$message.$+$The$+$text$+$message$+$consists$+$of$+$one$+$or$+$more$+$words$+$where$+$the$+$length$+$of$+$the$+$text$+$message$+$string$+$is$+$at$+$least$+$one$+$character.$\%0$A$\%0$AConsider$+$the$+$code$+$below$\%3$A$\%0$A$\%0$AMessage$+$msg$1+\%3$D$+$new$+$Message$\%28\%2208+$abc$123$xy$+16+$Computer$+$Science$\%22\%29\%3$B$+\%2$F$\%2$Fcreates$+$a$+$new$+$message$+$object$\%0$Aboolean$+$msg$1$Valid$+\%3$D$+$msg$1.$isValid$\%28\%29\%3$B$+\%2$F$\%2$F$+$returns$+$true$+$for$+$a$+$valid$+$message$\%0$AString$+$text$+\%3$D$+\%2211+$radio$11$a$287+14\%22\%3$B$\%0$AMessage$+$msg$2+\%3$D$+$new$+$Message$\%28$text$\%29\%3$B$\%0$Aboolean$+$msg$2$Valid$+\%3$D$+$msg$2.$isValid$\%28\%29\%3$B$+\%2$F$\%2$F$+$returns$+$false$+$for$+$an$+$invalid$+$message$\%0$AMessage$+$msg$3+\%3$D$+$new$+$Message$\%28\%2204+92$a$1+16+$Computer$+$Science$\%22\%29\%3$B$\%0$AMessage$+$msg$4+\%3$D$+$new$+$Message$\%28\%2203+$x$8$r$+21+$Today$+$is$+$a$+$great$+$day$\%21\%22\%29\%3$B$\%0$Aint$+$numWords$+\%3$D$+$msg$4.$wordCount$\%28\%29\%3$B$+\%2$F$\%2$Freturns$+5\%2$C$+$the$+$number$+$of$+$words$+$in$+$the$\%0$A$\%2$F$\%2$Ftext$+$message$\%0$A$\%0$AComplete$+$the$+$Message$+$class$+$by$+$writing$+$the$+$isValid$\%28\%29+$and$+$wordcount$\%28\%29+$methods.$\%0$A$\%0$Apublic$+$class$+$Message$\%7$B$\%0$A$\%0$A$+++++$private$+$int$+$idLength$\%3$B$\%0$A$+++++$private$+$String$+$deviceID$\%3$B$\%0$A$+++++$private$+$int$+$msgLength$\%3$B$\%0$A$+++++$private$+$String$+$textMsg$\%3$B$\%0$A$\%0$A$+++++$public$+$Message$\%28$String$+$msg$\%29\%7$B$\%0$A$+++++\%2$F$\%2$Fimplementation$+$not$+$shown$\%0$A$+++++\%7$D$\%0$A$\%0$A$+++++$public$+$boolean$+$isValid$\%28\%29\%7$B$\%0$A$+++++\%2$F$\%2$Fto$+$be$+$written$\%0$A$+++++\%7$D$\%0$A$\%0$A$+++++$public$+$int$+$wordCount$\%28\%29\%7$B$\%0$A$+++++\%2$F$\%2$Fto$+$be$+$written$\%0$A$+++++\%7$D$\%0$A$\%0$A$\%7$D$\%3$C$\%2$Fp$\%3$E$\%3$C$\%2$Fdiv$\%3$E&searchid$=$b$808$ed$7$e$-3$f$1$e$-4$c$3$e$-9$eb$7-$abd$9$d$898$c$941$&strackid$=005$c$9$f$3$fe$054$&trackid$=$ba$7$ff$16$faabd